:root{
    --ink:#0B1220;
    --ink-soft:#3A4A52;
    --brand-blue:#264A9E;
    --emerald:#00A87E;
    --emerald-deep:#045C3F;
    --mint:#F5FAF8;
    --line:#E3ECE8;
    --paper:#FFFFFF;
    --mono:'JetBrains Mono', monospace;
    --sans:'Noto Sans JP', sans-serif;
  }
  *{box-sizing:border-box; margin:0; padding:0;}
  html{scroll-behavior:smooth;}
  body{
    font-family:var(--sans);
    color:var(--ink);
    background:var(--paper);
    line-height:1.75;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  a{color:inherit; text-decoration:none;}
  img{display:block; max-width:100%;}
  .wrap{max-width:1180px; margin:0 auto; padding:0 32px;}
  .eyebrow{
    font-family:var(--mono); font-size:12.5px; letter-spacing:.14em;
    color:var(--emerald-deep); font-weight:600; margin-bottom:18px;
    display:flex; align-items:center; gap:10px;
  }
  .eyebrow::before{content:''; width:16px; height:1px; background:var(--emerald); display:inline-block;}
  h1,h2,h3{font-weight:700; letter-spacing:-.01em;}
  h2{font-size:clamp(26px,3.4vw,40px); line-height:1.4; margin-bottom:22px;}
  p{color:var(--ink-soft); font-size:15.5px;}
  section{padding:120px 0; position:relative; border-top:1px solid var(--line);}

  /* ---------- condition tracker (signature element) ---------- */
  .tracker{
    position:fixed; left:26px; top:50%; transform:translateY(-50%);
    display:flex; flex-direction:column; gap:22px; z-index:50;
  }
  .tracker .dot{
    width:7px; height:7px; border-radius:50%; background:#D7E3DF;
    transition:all .5s cubic-bezier(.2,.8,.2,1); position:relative;
  }
  .tracker .dot.active{ background:var(--emerald); box-shadow:0 0 0 4px rgba(0,168,126,.15);}
  .tracker .dot::after{
    content:attr(data-label); position:absolute; left:16px; top:50%; transform:translateY(-50%);
    font-family:var(--mono); font-size:10px; letter-spacing:.06em; color:var(--ink-soft);
    white-space:nowrap; opacity:0; transition:opacity .3s;
  }
  .tracker .dot:hover::after{opacity:1;}
  @media (max-width:900px){ .tracker{display:none;} }

  /* ---------- header ---------- */
  header{
    position:fixed; top:0; left:0; right:0; z-index:40;
    background:rgba(255,255,255,.82); backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
  }
  header .inner{display:flex; align-items:center; justify-content:space-between; padding:16px 32px; max-width:1180px; margin:0 auto;}
  header img.logo{height:24px;}
  nav{display:flex; gap:34px; font-size:13.5px; color:var(--ink-soft);}
  nav a{transition:color .2s;}
  nav a:hover{color:var(--emerald-deep);}
  .btn{
    font-family:var(--mono); font-size:12.5px; letter-spacing:.05em;
    padding:10px 20px; border-radius:3px; border:1px solid var(--ink);
    transition:all .25s;
  }
  .btn.solid{background:var(--ink); color:#fff;}
  .btn.solid:hover{background:var(--emerald-deep); border-color:var(--emerald-deep);}
  .btn.ghost:hover{border-color:var(--emerald-deep); color:var(--emerald-deep);}
  @media (max-width:820px){ nav{display:none;} }

  .lang-switch{display:flex; border:1px solid var(--line); border-radius:20px; padding:3px; gap:2px;}
  .lang-switch button{
    font-family:var(--mono); font-size:11px; letter-spacing:.04em; padding:5px 12px; border-radius:16px;
    border:none; background:transparent; color:var(--ink-soft); cursor:pointer; transition:all .2s;
  }
  .lang-switch button.active{background:var(--ink); color:#fff;}

  /* ---------- hero ---------- */
  .hero{
    position:relative;
    padding-top:170px; padding-bottom:110px; border-top:none;
    display:flex; align-items:center;
  }
  .hero-content{width:100%;}
  .hero-flat{width:100%; max-width:980px; height:auto; display:block; margin-bottom:34px;}
  .hero-flat-en{position:relative; margin-bottom:34px; border-radius:8px; overflow:hidden; min-height:420px; display:flex; align-items:center;}
  .hero-en-bg-wrap{position:absolute; top:0; right:0; bottom:0; left:0; overflow:hidden; z-index:0;}
  .hero-en-bg-track{
    display:flex; width:200%; height:100%;
    animation:heroScroll 26s linear infinite;
  }
  .hero-en-bg-track .scroll-img{width:50%; height:100%; object-fit:cover; flex-shrink:0; display:block;}
  @keyframes heroScroll{
    from{ transform:translateX(0); }
    to{ transform:translateX(-50%); }
  }
  .hero-en-scrim{
    position:absolute; top:0; right:0; bottom:0; left:0; z-index:1;
    background:linear-gradient(100deg,
      rgba(255,255,255,.98) 0%,
      rgba(255,255,255,.93) 30%,
      rgba(255,255,255,.6) 52%,
      rgba(255,255,255,.15) 72%,
      rgba(255,255,255,0) 90%);
  }
  .hero-en-text{position:relative; z-index:2; padding:44px 40px;}
  @media (max-width:900px){
    .hero-flat-en{min-height:auto;}
    .hero-en-scrim{background:linear-gradient(180deg, rgba(255,255,255,.97) 0%, rgba(255,255,255,.93) 55%, rgba(255,255,255,.8) 100%);}
  }
  @media (prefers-reduced-motion: reduce){
    .hero-en-bg-track{animation:none;}
  }
  .hero .ctas{display:flex; gap:14px;}
  .hero .tag{
    position:absolute; z-index:2; right:32px; bottom:36px;
    background:rgba(11,18,32,.72); color:#fff;
    font-family:var(--mono); font-size:10.5px; letter-spacing:.06em;
    padding:8px 14px; border-radius:3px;
  }
  html.lang-en .ja-only{display:none;}
  html:not(.lang-en) .en-only{display:none;}
  @media (max-width:900px){
    .hero{padding-top:140px;}
    .hero .tag{display:none;}
  }

  /* ---------- information control ---------- */
  .accent-line{font-size:16.5px; color:var(--emerald-deep); font-weight:600; margin-bottom:40px;}
  .info-control-card{
    border:1px solid var(--line); border-radius:10px; padding:34px 36px; background:var(--mint);
    max-width:640px; margin-bottom:56px;
  }
  .info-control-card .tag{font-family:var(--mono); font-size:11px; letter-spacing:.08em; color:var(--emerald-deep); margin-bottom:14px;}
  .info-control-card h4{font-size:21px; margin-bottom:14px;}
  .info-control-card p{font-size:14.5px;}
  .cond-cap{font-family:var(--mono); font-size:11.5px; letter-spacing:.06em; color:var(--ink-soft); margin-bottom:16px;}
  .cond-title{font-size:22px; font-weight:700; margin-bottom:34px;}
  .cond-grid{display:grid; grid-template-columns:repeat(5,1fr); gap:16px;}
  .cond-card{border:1px solid var(--line); border-radius:10px; padding:24px 18px;}
  .cond-card .icon{
    width:44px; height:44px; border-radius:50%; display:flex; align-items:center; justify-content:center;
    margin-bottom:16px; color:#fff;
  }
  .cond-card .icon svg{width:20px; height:20px;}
  .cond-card h5{font-size:15px; margin-bottom:2px;}
  .cond-card .jp{font-family:var(--sans); font-size:12px; color:var(--ink-soft); margin-bottom:12px;}
  .cond-card p{font-size:12.5px; line-height:1.6;}
  .closing-line{margin-top:40px; font-size:14.5px; color:var(--ink-soft);}
  .cond-visual{margin-top:48px; border:1px solid var(--line); border-radius:10px; padding:20px; background:var(--mint);}
  .cond-visual img{width:100%; border-radius:6px; display:block;}
  @media (max-width:1000px){ .cond-grid{grid-template-columns:repeat(2,1fr);} }
  @media (max-width:560px){ .cond-grid{grid-template-columns:1fr;} }

  /* ---------- challenge icons ---------- */
  .grid4{display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--line); border:1px solid var(--line); margin-top:44px;}
  .grid4 .cell{background:#fff; padding:30px 22px;}
  .grid4 .num{font-family:var(--mono); font-size:11px; color:var(--emerald); margin-bottom:14px;}
  .grid4 .cell h4{font-size:15px; margin-bottom:8px;}
  .grid4 .cell p{font-size:13.5px;}
  @media (max-width:820px){ .grid4{grid-template-columns:repeat(2,1fr);} }

  /* ---------- how it works ---------- */
  .hiw{display:grid; grid-template-columns:1fr 1fr; gap:56px; margin-top:10px;}
  .hiw .col h3{font-family:var(--mono); font-size:13px; letter-spacing:.06em; color:var(--emerald-deep); margin-bottom:20px;}
  .hiw ol{list-style:none; counter-reset:step;}
  .hiw li{counter-increment:step; padding-left:34px; position:relative; margin-bottom:16px; font-size:14.5px; color:var(--ink-soft);}
  .hiw li::before{
    content:counter(step); position:absolute; left:0; top:0; width:22px; height:22px;
    border:1px solid var(--line); border-radius:50%; font-family:var(--mono); font-size:11px;
    display:flex; align-items:center; justify-content:center; color:var(--ink-soft);
  }
  .quantum-figure{margin-top:70px; text-align:center;}
  .quantum-figure img{max-width:340px; margin:0 auto 14px; border:1px solid var(--line); border-radius:8px;}
  .quantum-figure .cap{font-family:var(--mono); font-size:11.5px; color:var(--ink-soft);}

  /* ---------- solution cards ---------- */
  .cards3{display:grid; grid-template-columns:repeat(3,1fr); gap:22px; margin-top:44px;}
  .card{border:1px solid var(--line); border-radius:8px; padding:32px 26px; transition:box-shadow .3s, transform .3s;}
  .card:hover{box-shadow:0 20px 40px -24px rgba(4,92,63,.25); transform:translateY(-3px);}
  .card .tag{font-family:var(--mono); font-size:11px; color:var(--emerald); letter-spacing:.08em; margin-bottom:16px;}
  .card h4{font-size:19px; margin-bottom:12px;}
  .card p{font-size:13.8px;}
  @media (max-width:900px){ .cards3{grid-template-columns:1fr;} }

  /* ---------- comparison table ---------- */
  table{width:100%; border-collapse:collapse; margin-top:40px; font-size:13.8px;}
  th,td{text-align:left; padding:16px 14px; border-bottom:1px solid var(--line); vertical-align:top;}
  th{font-family:var(--mono); font-size:11.5px; letter-spacing:.04em; color:var(--ink-soft); font-weight:500;}
  tr.tnc td{background:rgba(0,168,126,.05);}
  tr.tnc td:first-child{font-weight:700; color:var(--emerald-deep);}

  /* ---------- product ---------- */
  .product{display:grid; grid-template-columns:1fr 1fr; gap:50px; align-items:center;}
  .product-visual img.netuse{width:100%; border-radius:8px; border:1px solid var(--line); display:block;}
  .product-visual .cap{font-family:var(--mono); font-size:11px; color:var(--ink-soft); margin-top:12px;}
  .chip-strip{display:flex; align-items:center; gap:12px; margin-top:18px;}
  .chip-strip img{width:52px; height:52px; object-fit:cover; border-radius:6px; border:1px solid var(--line); opacity:.82; filter:grayscale(.15);}
  .chip-strip .chip-label{font-family:var(--mono); font-size:10.5px; color:var(--ink-soft); letter-spacing:.03em;}
  .spec-list{margin-top:26px; display:flex; flex-direction:column; gap:12px;}
  .spec-list div{display:flex; justify-content:space-between; border-bottom:1px dashed var(--line); padding-bottom:10px; font-size:13.8px;}
  .spec-list span:first-child{font-family:var(--mono); color:var(--ink-soft); font-size:11.5px;}
  @media (max-width:900px){ .product{grid-template-columns:1fr;} }

  /* ---------- use cases ---------- */
  .cases{display:grid; grid-template-columns:1fr 1fr; gap:26px; margin-top:44px;}
  .case{border:1px solid var(--line); border-radius:10px; overflow:hidden;}
  .case img{height:230px; width:100%; object-fit:cover;}
  .case .body{padding:24px 26px;}
  .case .tag{font-family:var(--mono); font-size:11px; color:var(--emerald-deep); margin-bottom:8px;}
  .case h4{font-size:17px; margin-bottom:10px;}
  .case p{font-size:13.8px;}
  .sector-tags{display:flex; flex-wrap:wrap; gap:10px; margin-top:32px;}
  .sector-tags span{
    font-family:var(--mono); font-size:11.5px; padding:8px 14px; border:1px solid var(--line);
    border-radius:20px; color:var(--ink-soft);
  }
  @media (max-width:820px){ .cases{grid-template-columns:1fr;} }

  /* ---------- team strip ---------- */
  .team{display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:24px;}
  .team p{max-width:560px;}

  /* ---------- CTA ---------- */
  .cta{
    background:#0B2E22; color:#fff; text-align:center; border-top:none;
  }
  .cta h2{color:#fff;}
  .cta p{color:#AFCFC0; max-width:520px; margin:0 auto 34px;}
  .cta .btn.solid{background:var(--emerald); border-color:var(--emerald); color:#0B2E22;}
  .cta .btn.solid:hover{background:#fff; border-color:#fff; color:#0B2E22;}
  .cta .btn.ghost{border-color:#2E5C4B; color:#fff;}
  .cta .btn.ghost:hover{border-color:var(--emerald); color:var(--emerald);}

  footer{padding:34px 0; text-align:center; font-family:var(--mono); font-size:11.5px; color:#7FA294; background:#082019;}

  /* ---------- scroll reveal (signature interaction) ---------- */
  /* Progressive enhancement: content is fully visible by default.
     JS adds .pre-reveal on load, then swaps to .is-visible on scroll-into-view.
     If JS fails, nothing is ever hidden. */
  .reveal.pre-reveal{opacity:0; transform:translateY(22px); filter:blur(4px) saturate(.7);}
  .reveal{transition:opacity 1s cubic-bezier(.2,.7,.2,1), transform 1s cubic-bezier(.2,.7,.2,1), filter 1s cubic-bezier(.2,.7,.2,1);}
  .reveal.is-visible{opacity:1; transform:translateY(0); filter:blur(0) saturate(1);}
  @media (prefers-reduced-motion: reduce){
    .reveal.pre-reveal{opacity:1; transform:none; filter:none;}
    .reveal{transition:none;}
  }